On 04-May-2014 14:13:27 Jorge I Velez wrote: > Try > > options(digits = 22) > 168988580159 * 36662978 ># [1] 6195624596620653568 > > HTH, > Jorge.-
Err, not quite ... ! I hitch my horses to my plough (with help from R): options(digits=22) 168988580159*8 = 1351908641272 (copy down) 168988580159*7 = 1182920061113 ( " " ) 168988580159*9 = 1520897221431 ( " " ) 168988580159*2 = 337977160318 ( " " ) 168988580159*6 = 1013931480954 ( " " )^3 168988580159*3 = 506965740477 ( " " ) 1351908641272 11829200611130 152089722143100 337977160318000 10139314809540000 101393148095400000 1013931480954000000 5069657404770000000 ====================== 6195624596620653502 [after adding up mentally] compared with Jorge's: 6195624596620653568 ("02" vs "68" in the final two digits). Alternatively, if using a unixoid system with 'bc' present, one can try interfacing R with 'bc'. 'bc' is an calculating engine which works to arbitrary precision. There certainly used to be a utility in which R can evoke 'bc', into which one can enter a 'bc' command and get the result returned as a string, but I can't seem to find it on CRAN now. In any case, the raw UNIX command line for this calculation with 'bc' (with result) is: $ bc -l [...] 168988580159 * 36662978 6195624596620653502 quit which agrees with my horse-drawn working. Best wishes to all, Ted. > On Sun, May 4, 2014 at 10:44 PM, ARTENTOR Diego Tentor < > diegotento...@gmail.com> wrote: > >> Trying algorithm for products with large numbers i encountered a difference >> between result of 168988580159 * 36662978 in my algorithm and r product. >> The Microsoft calculator confirm my number. >> >> Thanks. >> -- >> * Gráfica ARTENTOR * >> >> de Diego L. Tentor >> Echagüe 558 >> Tel.:0343 4310119 >> Paraná - Entre Ríos ------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@wlandres.net> Date: 04-May-2014 Time: 17:50:54 This message was sent by XFMail ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.